Station switch-board and connection



(No Model.) 2 Sheet8heet 1. E. W- RICB. Jr-. 85 A. L. ROHRER. STATION SWITCH BOARD AND CONNECTION.

Patented Oct. 1, 1889.

gmwmto cs. Elwin, Jr. 4 Amen 1.2457517 $1 Meir altozuua (No Model.) -2 Sheets-Sheet 2. E. W. RICE, Jr., 81; A. L. ROHRER. STATION SWITCH BOARD AND CONNECTION.

No. 411,930. Patented Oct. 1. 1889.

$111 IllCll Elwin WZZc'ce J?! 5 Ji'ZZeri .LROArer, 14311 N. "TE". MW. WM MC UNITED STATES PATENT OFFICE.

EDWVIN IVILBUR RICE, JR, AND ALBERT L. ROHRER, OF LYNN, MASSACHUSETTS.

STATION SWITCH-BOARD AND CONNECTION.

SPECIFICATION formingpart of Letters Patent No. 411,930,dated October 1, 1889.

Application filed July 29, 1889. Serial No. 319,039. (No model.)

To all whom it may concern:

Be it known that we, Enwnv WILBUR RICE, J1, and ALBERT L. ROHRER, citizens of the United States, and residents of Lynn, in the county of Essex and State of Massachusetts, have invented a certain new and useful Station Switch-Board and Circuit-Connections, of which the following is a specification.

Our invention relates to means whereby two or more dynamo-machines may be connected in multiple to supply currents to electric mains, and at the same time an equalizing-connection, of the nature described in Patent No. 328,253, dated October 13, 1886, may be formed between such dynamos.

Our invention consists, essentially, in the combination, with electric switches controlling the connection of the dynamos in multiple arc to electric mains or conductors, of supplemental switch-contacts controlled by each of such switches and placed in the circuits from the dynamos to a wire or connection forming with such circuits an equalizingconnection.

In the accompanying drawings, Figure 1 illustrates the invention diagrammatically as applied to dyamos feeding two wire mains or conductors in multiple. Fig. 2 illustrates the invention as applied to dynamos used in a three-wire system of distribution and as combined with switches whereby the dynamos may be applied to feed-current on one or the other side of the middle wire of the system, according to changes in the load.

Referring to Fig. 1, A A indicate the armatures of two dynamos, and F F the field magnet coils in series with such armatures. The shunt field-magnet coil supplied either I from the brushes of the armature A or from nected with the wires by means of the switches, they feed the same in multiple arc. The switch S is shown as a two-part switch, one part L controlling the connection a from one pole of the dynamo to the main or wire IT, and the other L controlling the connection I) to the other main or wire P. The part L of the switch is arranged to make a double break at the points 7c in the connection a, and the part L makes a similar double break in the connection I) at the points k k.

The construct-ion of the switch just described is well known in the art and need not be explained further in detail. \Vhile we have shown the switch constructed so as to make a double break, it is obvious that a single-break switch might be employed, and it is likewise obvious that instead of making and breaking the connections from both poles of the dynamos it will be suflicient to make and break the connections to one pole only.

S is a switch similar in its construction to switch S.

E indicates a wire, plate or conductor that in connection with proper circuits from the dynamos forms an equalizing circuit or connection, according to the patent before referred to.

Each of the switches described is provided with a supplemental lever L which is operated with the other parts described and completes a double break, as indicated in the connection from wire 0 to E. lVire 0 connects, as shown, to the point between the dynamo-arinature and the direct-circuit fieldmaguet coil. Switch S controls in a similar manner the connection 0'. Any number of dynamos might be arranged similarly to those described and each provided with the switch having the supplemental switch devices shown and described.

By operating switch S the wire a is connected to the negative conductor N, the wire 5 to the conductor P, and the wire 0 to the conductor E. In like manner the operation of the switch S will connect a to N, bto P, andc to E. The dynamos are then connected in multiple to feed the mains N P or the feed-conductors f (I, connected therewith, while at the same time an equalizing or compensating circuit exists by way of wires 0' c and the equalizing-wire E, which will operate in the manner described in the Patent No. 328,253.

It is obvious that other dynamos might be connected in a similar way to wires N P with the simultaneous formation of an equalizing connection between such additional dynamos and those shown.

In Fig. 2, D D D D are four dynamos adapted to supply three wire mains M M M the latter being the middle wire of the system and connected, as indicated, to wires, plates, or conductors N P, themselves connected together in proximity to the switches S S S S. each switch is constructed to have a double throw, so that each dynamo may be made to feed current on one or the other side of the middle wire of the system. Conductor or wire P connects, as shown, to the main M, and is properly located in proximity to the switches, while conductor N, at or near the switches, connects to the opposite wire M of the system. Switch S, in the position shown, connects dynamo D to the conductors P N when in the positionshown. By means of the contacts 70 on the opposite side of the switch it controls the connections onthe same poles of the dynamo with the wires, plates, or strips P N, respectively. As will be obvious, the effect of throwing the switch from the position shown will be to substitute mains M M for mains M" and M in the connection between the two poles of such dynamo. Switch S controls in a similar manner the connections of dynamo D. Switches S S operate in the same manner in connection with their dynamos and are shown in the reverse position from switches S S, so that while dynamos D D are connected in multiple to P N, so as to feed M M inmultiple, dynamos D D each feed P and N in multiple, which are connected, respectively, to the conductors or mains M and M. When the switches are in the position shown, therefore, two dynamos are in multiple and two in series. Should the load on one side of the middle wireas, for instance, be-

trolling t1e connection of the wires 0 c, &c.,

with the equalizing wire or strip E, but in each case the supplemental switch-lever L is made as a double-throwlever, so that when the switch is reversed from the position In this instance shown at S it maymake connection with the wire .0 c, &c., to a second equalizer bar, wire, or conductor E in obvious manner. In the position of the switches shown, therefore, the dynamos D D have an equalizer-circuit established by the wire or connection E, while the dynamos D D which are connected in multiple, have an equalizing circuit or connection established by the bar E. If either switch be thrown over to put three dynamos in multiple, such three dynamos will obviously be connected by the equalizerbar E or E, according to the switch thrown. Thus, for instance, if switch S be thrown over, the dynamos D D D will feed P 'N and M M in multiple, but will form at the same time the equalizing circuit or connection required by the patent before referred to. Dynamo D, which now feeds mains or wires alone instead of in multiple, will not have any equalizing circuit or connection with any other dynamo, such circuit having been broken by the throw of switch S from the position shown to its opposite position, such operation having disconnected wire 0' from the equalizer-bar E, to which the dynamo D is connected.

What we claim as our invention is 1. The combination, with dynamo machines, of electric switches controlling the connections of such machines in multiple arc to the conductors or mains to be supplied and provided with supplemental switch-eontacts in circuits from such machines to an equalizing bar or connection.

2. The combination, with dynamomachines, of double-throw electric switches controlling the connection of such dynamos in multiple to a three-wire system and provided with a supplemental double-throw switch device controlling the connection of such dynamos with two equalizing bars or circuits E E, as and for the purpose described.

3. The combination, with three wire mains or circuits and a number of dynamos having switches for connecting such dynamos in multiple to either side of the system at pleasure, of two equalizing bars or connectionsone for forming an equalizing-connection when the dynamos are connected in multiple to one side of the system, and the other for forming a similar connection when they are connected to the other side of the system, as and for the purpose described.

State of Massachusetts, this 22d day of July, A. D. 1880.

EDWIN WILBUR RICE, JR. ALBERT L. ROHRER.

WVitnesses:

JOHN W. GIBBONEY,

DUGALD McKILLoP.

Signed at Lynn, in the county of Essex and 

